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fence_ldom.py

#!/usr/bin/python

##
## The Following Agent Has Been Tested On - LDOM 1.0.3
## The interface is backward compatible so it will work 
## with 1.0, 1.0.1 and .2 too.
## 
#####

import sys, re, pexpect
sys.path.append("@FENCEAGENTSLIBDIR@")
from fencing import *

#BEGIN_VERSION_GENERATION
RELEASE_VERSION="Logical Domains (LDoms) fence Agent"
REDHAT_COPYRIGHT=""
BUILD_DATE=""
#END_VERSION_GENERATION

COMMAND_PROMPT_REG="\[PEXPECT\]$"
COMMAND_PROMPT_NEW="[PEXPECT]"

# Start comunicating after login. Prepare good environment.
def start_communication(conn, options):
      conn.sendline ("PS1='"+COMMAND_PROMPT_NEW+"'")
      res=conn.expect([pexpect.TIMEOUT, COMMAND_PROMPT_REG],int(options["-Y"]))
      if res==0:
            #CSH stuff
            conn.sendline("set prompt='"+COMMAND_PROMPT_NEW+"'")
            conn.log_expect(options, COMMAND_PROMPT_REG,int(options["-Y"]))
      

def get_power_status(conn, options):
      try:
            start_communication(conn,options)
            
            conn.sendline("ldm ls")
                
            conn.log_expect(options,COMMAND_PROMPT_REG,int(options["-Y"]))

            result={}

            #This is status of mini finite automata. 0 = we didn't found NAME and STATE, 1 = we did
            fa_status=0
            
            for line in conn.before.splitlines():
                  domain=re.search("^(\S+)\s+(\S+)\s+.*$",line)

                  if (domain!=None):
                        if ((fa_status==0) and (domain.group(1)=="NAME") and (domain.group(2)=="STATE")):
                              fa_status=1
                        elif (fa_status==1):
                              result[domain.group(1)]=("",(domain.group(2).lower()=="bound" and "off" or "on"))

      except pexpect.EOF:
            fail(EC_CONNECTION_LOST)
      except pexpect.TIMEOUT:
            fail(EC_TIMED_OUT)

      if (not (options["-o"] in ['monitor','list'])):
            if (not (options["-n"] in result)):
                  fail_usage("Failed: You have to enter existing logical domain!")
            else:
                  return result[options["-n"]][1]
      else:
            return result

def set_power_status(conn, options):
      try:
            start_communication(conn,options)
            
            cmd_line="ldm "+(options["-o"]=="on" and "start" or "stop -f")+" \""+options["-n"]+"\""
                  
            conn.sendline(cmd_line)
                
            conn.log_expect(options,COMMAND_PROMPT_REG,int(options["-g"]))
            
      except pexpect.EOF:
            fail(EC_CONNECTION_LOST)
      except pexpect.TIMEOUT:
            fail(EC_TIMED_OUT)
            
def main():
      device_opt = [  "help", "version", "agent", "quiet", "verbose", "debug",
                  "action", "ipaddr", "login", "passwd", "passwd_script",
                  "secure",  "identity_file", "test" , "port", "cmd_prompt",
                  "separator", "inet4_only", "inet6_only", "ipport",
                  "power_timeout", "shell_timeout", "login_timeout", "power_wait" ]

      atexit.register(atexit_handler)

      pinput = process_input(device_opt)
      pinput["-x"] = 1
      options = check_input(device_opt, pinput)

      ## 
      ## Fence agent specific defaults
      #####
      if (not options.has_key("-c")):
            options["-c"] = "\ $"
      
      docs = { }
      docs["shortdesc"] = "Fence agent for Sun LDOM"
      docs["longdesc"] = "fence_ldom is an I/O Fencing agent \
which can be used with LDoms virtual machines. This agent works \
so, that run ldm command on host machine. So ldm must be directly \
runnable.\
\n.P\n\
Very useful parameter is -c (or cmd_prompt in stdin mode). This \
must be set to something, what is displayed after successful login \
to host machine. Default string is space on end of string (default \
for root in bash). But (for example) csh use ], so in that case you \
must use parameter -c with argument ]. Very similar situation is, \
if you use bash and login to host machine with other user than \
root. Than prompt is $, so again, you must use parameter -c."
      docs["vendorurl"] = "http://www.sun.com"
      show_docs(options, docs)

      ##
      ## Operate the fencing device
      ####
      conn = fence_login(options)
      result = fence_action(conn, options, set_power_status, get_power_status,get_power_status)

      ##
      ## Logout from system
      ######
      try:
            conn.sendline("logout")
            conn.close()
      except exceptions.OSError:
            pass
      except pexpect.ExceptionPexpect:
            pass

      sys.exit(result)        

if __name__ == "__main__":
      main()

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